/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.state.api.input.splits;

import org.apache.flink.annotation.Internal;
import org.apache.flink.core.io.InputSplit;
import org.apache.flink.runtime.checkpoint.OperatorSubtaskState;
import org.apache.flink.runtime.checkpoint.PrioritizedOperatorSubtaskState;
import org.apache.flink.runtime.checkpoint.StateObjectCollection;
import org.apache.flink.runtime.state.KeyedStateHandle;

import java.util.Collections;
import java.util.List;

/** An input split representing a key-group range from a savepoint. */
@Internal
public final class KeyGroupRangeInputSplit implements InputSplit {

    private static final long serialVersionUID = -3715297712294815706L;

    private final List<KeyedStateHandle> managedKeyedState;

    private final List<KeyedStateHandle> rawKeyedState;

    private final int numKeyGroups;

    private final int split;

    public KeyGroupRangeInputSplit(
            List<KeyedStateHandle> managedKeyedState,
            List<KeyedStateHandle> rawKeyedState,
            int numKeyGroups,
            int split) {

        this.managedKeyedState = managedKeyedState;
        this.rawKeyedState = rawKeyedState;

        this.numKeyGroups = numKeyGroups;
        this.split = split;
    }

    @Override
    public int getSplitNumber() {
        return split;
    }

    public PrioritizedOperatorSubtaskState getPrioritizedOperatorSubtaskState() {
        final OperatorSubtaskState subtaskState =
                OperatorSubtaskState.builder()
                        .setManagedKeyedState(new StateObjectCollection<>(managedKeyedState))
                        .setRawKeyedState(new StateObjectCollection<>(rawKeyedState))
                        .build();
        return new PrioritizedOperatorSubtaskState.Builder(subtaskState, Collections.emptyList())
                .build();
    }

    public int getNumKeyGroups() {
        return numKeyGroups;
    }
}
